NO. 1105. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



195 



provided with rather a large rostellum armed with a double crown of 

 about 90 hooks 18 /.i long. Suckers round and quite large 5 hooks on 

 suckers not observed. Genital pores unilateral. A single egg in each 

 egg sac. 



Hos L Man (Homo sapiens). Found in Mayotte, Mauritius, and 

 Bangkok. 



DAVAINEA CONTORTA, Zschokke, 1895. 

 (Plate XXII, fig. 2.) 



1895, Davainea contorta, ZSCHOKKE, Centralbl. f. Bakter. u. Parasitenk., Pt. I, 

 XVII (18-19), pp. 634-645, figs. 1-4. 21 May. 



Diagnosis. Davainea contorta, Zschokke, 1895. Strobila attains 40 

 to 80 mm. in length by 0.75 mm. in breadth, and contains 400 to 800 

 segments, all of which are broader than long 5 margin of strobila ser- 

 rate. Scolex small, prismatic; rostellum large, armed with (? a single 

 row of) numerous minute hooklets; suckers large, armed with 8 to 10 

 rows of minute hooklets. Genital organs differentiate in fortieth to 

 sixtieth segment. Genital pores unilateral, in middle of lateral mar- 

 gin. Male organs: Cirrus pouch one-fourth to one third as Jong as the 

 segment is broad; testicles two, large, in dorsal portion of median field 

 on aporose side of median line. Female organs : Ovary bilobed ; gravid 

 segments filled with large egg capsules, each with a single egg pos- 

 sessing two shells. 



Host. Common Indian Pangolin (Manis pentadactyla). Type with 

 Zschokke. 



DAVAINEA RETRACTILIS, Stiles, 1895. 



(Plate XXI, figs. 1-6; Plate XXII, fig. 1.) 

 1895, Davainea retractilis, STILES, Veterinary Magazine, II, June, p. 343. Aug. 28, 1895. 



Of this species, I have seven strobile, collected March 10, 1891, in 

 Nevada, by Dr. Fisher, of the Division of Mammalogy and Ornithology, 

 United States Department of Agriculture. The original label reads: 

 "Biological Explorations, U. S. Dept. Agr., Death Valley Expedition, 

 Ash Meadows, Nevada, Mch. 10, 1891. A. K. Fisher. Nye Co. Tape- 

 worms from Cottontail, No. 362." A reference to the specimen in the 

 Division of Mammalogy and Ornithology shows that the host is Lepus 

 arizonce. 



Measurements of Davainea retractilis. 



